Non-contact Low Power EEG/ECG Electrode for High Density Wearable Biopotential Sensor Networks

Authors:
Yu M. Chi;Stephen R. Deiss;Gert Cauwenberghs
Affiliations:
-;-;-
Venue:
BSN '09 Proceedings of the 2009 Sixth International Workshop on Wearable and Implantable Body Sensor Networks
Year:
2009

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Abstract

A non-contact capacitive biopotential electrode with a common-mode noise suppression circuit is presented. The sensor network utilizes a single conductive sheet to establish a common body wide reference line, eliminating the need for an explicit signal ground connection. Each electrode senses the local biopotential with a differential gain of 46dB over a 1-100Hz bandwidth. Signals are digitized directly on board with a 16-bit ADC. The coin sized electrode consumes 285uA from a single 3.3V supply, and interfaces with a serial data bus for daisy-chain integration in body area sensor networks.